Question 1118214
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8 liters of the 22% solution contain 0.22*8 liters of the vinegar.


9 liters of the 76% solution contain 0.76*9 liters of the vinegar.


The mixture has the volume of 8 liters + 9 liters = 17 liters

and contains  0.22*8 + 0.76*9  liters of vinegar.


The concentration of the mixture is the ratio of the vinegar volume to the total mixture volume of 17 liters:


    concentration = {{{(0.22*8 + 0.76*9)/(8+9)}}} = 0.5059  or  50.59%.


It is your


<U>Answer</U>.  The concentration of the mixture is 0.5059,  or  50.59%.
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Memorize the method on how I derived this value: &nbsp;in your school years you will meet such problems &nbsp;MANY &nbsp;TIMES.